Add install target to put utilities into chroot (in /opt/bin/)

src/platform/vboot_reference/Makefile

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 export CC ?= gcc
 export CFLAGS = -Wall -DNDEBUG -O3 -Werror
 export TOP = $(shell pwd)
 export FWDIR=$(TOP)/vboot_firmware
 export INCLUDES = \
         -I$(FWDIR)/include \
         -I$(TOP)/misclibs/include
 
 export FWLIB=$(FWDIR)/vboot_fw.a
 
 SUBDIRS=vboot_firmware misclibs vfirmware vkernel utility tests
 
 all:
         set -e; \
         for i in $(SUBDIRS); do \
                 make -C $$i; \
         done
 
 clean:
         set -e; \
         for i in $(SUBDIRS); do \
                 make -C $$i clean; \
         done
+
+install:
+        $(MAKE) -C utility install